clang++: add page (#6501)

pages/common/clang++.md

@@ -0,0 +1,25 @@
+# clang++
+
+> Compiles C++ source files.
+> Part of LLVM.
+> More information: <https://clang.llvm.org>.
+
+- Compile a source code file into an executable binary:
+
+`clang++ {{path/to/source.cpp}} -o {{path/to/output_executable}}`
+
+- Display (almost) all errors and warnings:
+
+`clang++ {{path/to/source.cpp}} -Wall -o {{path/to/output_executable}}`
+
+- Choose a language standard to compile with:
+
+`clang++ {{path/to/source.cpp}} -std={{c++20}} -o {{path/to/output_executable}}`
+
+- Include libraries located at a different path than the source file:
+
+`clang++ {{path/to/source.cpp}} -o {{path/to/output_executable}} -I{{path/to/header_path}} -L{{path/to/library_path}} -l{{path/to/library_name}}`
+
+- Compile source code into LLVM Intermediate Representation (IR):
+
+`clang++ -S -emit-llvm {{path/to/source.cpp}} -o {{path/to/output.ll}}`